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You make a good point. If the user experiences that a CPU core is constantly burned while using KDE, then they should be reporting it through KDE. In some sense KDE is to 'blame' in the sense that they stand between the underlying system and the user, and they should protect the user from such things.
Buggy video drivers, that don't work well in certain circumstances? I believe KDE should be adding ugly hacks around this in their system, while at the same time petitioning to get things fixed in the video drivers so the hacks can eventually be removed.
I think that it's the only way to get the users what they need over the long and short term.